It looks and feels like they are.
Is the main stop cock fully open? Circulation issue could be the pump, but its hard to actually figure it out without seeing it.
Ive had it before where the valve has broke and its been half open on the boiler but the lever was open as if it was fine
Yeah it is.
From what you've said so far, it's sounding likely that it's not directly caused by the engineer that did the last fix so it's not necessary to chase him up specifically.
@konastab01 started
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It looks and feels like they are.